Dial adding machine



Feb. 19, 1952 E. T. KNOPKE 2,586,058

DIAL ADDING MACHINE Filed Jan. 18, 1947 3 Sheets-Sheet l o o o o 0 "'0 00 000. 00

f INVENTOR. 1 4 WJW @M E TTURNEY Feb. 19, 1952 T. KNOPKE DIAL ADDING MACHINE 3 Sheets-Sheet 2 Filed Jan. 18, 1947 lll il'l INVENTOR. WTW

Feb. 19, 1952 E. T. KNOPKE 2,586,058

DIAL ADDING MACHINE Filed Jan. 18, 1947 5 Sheets-Sheet 3 Ell IN V EN TOR.

WJW

Patented Feb. 19, 1952 UNITED STATES PATENT OFFICE DIAL ADDING MACHINE Edward T. Knopke, Detroit, Mich.

Application January 18, 1947, Serial No. 722,897

1 Claim. 1

The object of my invention is to produce a small, portable adding machine, suitable for desk or drafting machine work, and that will occupy very little space.

Another object is to provide a small desk adding machine which will readily add either numerical units, or fractional units, together, for their respective summations, or their over-all dimensions, as are required on ordinary mechanical or structural drawings.

A further object is to produce a small, flat adding machine that can easily be packed away, or readily carried in the pocket, for immediate use at any time or place.

A still further object is to produce a dial adding machine that is simple in construction, easily and efficiently operated, and that can be manufactured at a very low cost.

These several objects are attained in the preferred form by the construction and arrangement of parts more fully hereinafter set forth.

Similar parts on all drawings are marked by similar numerals or letters.

Fig. 1 is a plan view of my dial adding machine, showing the general mechanical arrangement of the assembled operating parts, but with the graduation character numerals omitted in part.

Fig. 2 is a top, or edge view of the assembled adding machine, showing the relative positions of the various parts.

Fig. 3 is a plan view of the dial unit as removed from the indicator frame, showing the full disc design with the central bearing unit, and the dial graduation character numerals.

Fig. 4 is a cross-sectional view taken on the line 4-4 of the Fig. 1, illustrating a modified disc structure which may be substituted for the thin, fiat disc shown in the Figs. 1, and 2.

Fig. 5 is a back view of the tabulator frame,

showing the general frame design, and means for retaining the dial on the inclosed bearing disc.

Fig. 6 is a side view of the assembled tabulator frame, showing the relative position of its assembled parts.

Fig. '7 is a back view of an alternate form of tabulator frame, especially applicable to the modified disc design as shown in the Fig. l of the drawings, and as may be made of a single piece of material.

Fig. 8 is an edge view of the modified tabulator frame shown in the Fig. '7, showingthe exterior beveled surface design.

In general, my invention comprises a graduated dial, rotatably mounted within a tabulating frame, the dial graduations being based on some predetermined numerical unit as of weights, measures, values, &c., but herein illustrated as designed and graduated for addition of feet, inches, and fractions thereof, and each graduation point provided with identifying numerals to indicate the sum-total of successive dial movements from its initial zero point, as it passes through the tabulator frame.

I will now describe more the detailed construction of my device, referringto the drawings and the marks thereon. I

The dial 3 is circular in form and is herein illustrated as a thin, flat disc of a predetermined diameter, preferably made of suitable sheet material such as Celluloid, plastic material, light metal such as aluminum &c., and is designed with disc bearing 2 positioned concentric with the disc circumference. The dial I is rotatably mounted within a double sheet segment tabulator frame 3, by tightly clamping the. disc bearing 2 therein at the segment circle center. The tabulator frame 3 is formed approximately a segment of a circle having front and back walls a and b with outer circular edges of a slightly greater radius than the inclosed dial i, and which. are fixedly joined together along the circumference edges by suitable rivets 4, but separated by an intervening circular filler 5 positioned therebetween, and of sufficient thickness to allow free rotation of the dial therein. The central pivot section 0 of the frame 3, is circular in design, and of a diameter slightly greater than the inclosed bearing '2 clampedtherebetween and rigidly retained by the rivets 6, providing means for firmly retaining the dial 1 rotatably on the disc bearing edges. A light latch spring I is fixedly mounted within the inner edge of the circular segment filler-5, positioned therein adjacent the dial l circumference, designed and stressed to engage the dial circumference notch d for resetting said dial to its initial zero position when clearing the adding machine after completedfoperations The dial 1 is. herein illustrated and graduated for feet, inches, and for fractions of inches," and the graduations are indicated by small circular holes 8 formed through the disc plate, designed to receive an operating lead pencil point therein for readily rotating said dial predetermined amounts, during the addition operations. The graduations are arranged in separated circles concentric with the dialcenter of rotation, one circle for each character unit to be added, herein arranged with the inner circle A, the. central circle B, and the outer circle C, representing feet, inches, and fractions of inches respectively. The dial surface is divided, theoretically, into twelve equal segment sections e by the equally spaced radially positioned lines I, each section line representing a unit point with the respective graduation circles, and are herein designated by a zero character at each circleline intersection (although said lines f do not actually appear on the finished dial face), one of which represents the dial initial zero setting and is indicated by a large on the initial line i intersecting all three circles A, B and C. The inner circle A being for addition of even feet, each segment section e is divided and graduated into ten equal spaces indicated by the pencil point operating holes 8, each space representing one foot on the dial tabulating scale, or ten feet per each circular segment e, or 120 feet for the full dial circle. The central circle B being for addition of even inches, each segment 6 is divided into twelve equal spaces indicated by the pencil point operating holes 8, each space between holes representing one inch on the dial tabulating scale, or twelve inches per segment section e, or twelve feet for the full dial circle. The outer circle C being for addition of fractions of inches, each segment section e is divided and graduated into sixteen equal spaces indicated by the pencil point operating holes 3,

each space representing one sixteenth of an inch 1 on the dial tabulating scale, or one full inch per each segment section e, or twelve inches for the full dial circle. Each circle A, B, and C are oper ated independently of the others, and the tabulated sum-total of one circle can not be carried 1 over to another.

Inside the circle A representing feet, adjacent thereto, is arranged a row of segment numerals, beginning with 0 at each segment circle-line intersection, and numbered clockwise from 1 to 9 for each segment e, each numeral being placed directly opposite, radially, its respective graduation hole 8 throughout each section, and indicates the number of feet each graduation hole represents, per section from 1 to 10. inside the row of segment numerals, adjacent thereto, is arranged a second row of accumulative numerals from 1 to 11, beginning at the 0 in the second segment c after the initial dial 0, with the figures 1 throughout the segment e, and this figure is increased by 1 for each successive section e throughout the circle A, each figure being positioned directly opposite, radially, the respective segment numerals, and indicate the tenths, or the second figure used therewith,

representing the sum-total, in feet, accumulated by successive addition dial movements when disclosed through the indicator opening 9 formed through the tabulator frame 3, and as successive addition operations are made. Also through the face of the tabulator frame 3 is formed a circular segment slot opening in, positioned directly over the inner circle A, exposing a predetermined number of graduation holes 8 therethrough, and is provided with a series of reference numbers from 1 to along the adjacent slot edge, each number positioned directly opposite, radially, the respective corresponding graduation holes 8, providing convenient means for engaging the corresponding graduation hole with an operating pencil point, representing the number of feet to be added, and rotated, on the dial I, towards the zero end of the slot opening Hi. When the dial I is first set at its initial zero point. The sum-total is always disclosed through the ad- Directly jacent indicator opening 9 of the tabulator frame, for each dial rotation.

Inside the graduated circle B, representing inches, adjacent thereto, is arranged a row of segment numerals, beginning with 0 at each segment circle-line intersection, numbered clockwise from 1 to 11, for each segment 6, ach numeral being placed directly opposite, radially, its respective graduation hole 8 throughout each section, and indicates the number of inches each graduation hole represents per section from 0 to 12, or one foot per section e. Directly inside the row of segment numerals, adjacent thereto, is arranged a second row of accumulative numerals, arranged clockwise from 1 to 11, beginning at 0 in the second segment e after the initial dial 0, with the figures 1 throughout the segment section e, and increased by 1 for each successive section 6 throughout the circle, the same as in the former circle A, each figure being positioned directly opposite, radially, the successive segment numerals, and indicates the number of feet accumulated by the preceding segment sections during the successive addition dial rotations, as disclosed within the indicator opening ll formed through the tabulator frame 3. Also through the face of the frame 3 is formed a circular segment operating slot I2, positioned directly over the center graduation circle B, exposing a predetermined number of pencil point operating holes 8 therethrough, and is provided with a series of reference numbers from 1 to 18 along the adjacent curved frame edge, positioned directly opposite, radially, of each corresponding dial graduation hole, providing convenient means for engaging the proper hole 8 representing the number of inches to be added, with an operating pencil point, and rotate the dial i counterclockwise to the zero point of the slot {2, When the dial I is initially set at its 0 point, the sumtotal, in feet and inches, is always disclosed through its corresponding indicator opening ll of the tabulator frame 3, and for each successive dial operation.

Inside the outer graduation circle C, representing fractions of inches, adjacent thereto, is arranged a row of segment numerals, in fractions, beginning at 0 at each segment section circleline intersection, numbered clock-Wise from 1% to i-2- for each segment section 6, each fractional numeral being placed directly opposite its respective graduation hole 8 throughout each section e, and indicates the number of sixteenths of an inch, each graduation hole 8 represents per section, from 0 to 16, or one full inch per each section 6, or 12 inches for the full dial rotation. Directly inside the row of segment fractional numerals, adjacent thereto, is arranged a second row of accumulative numerals, arranged clock-wise from 1 to 11, beginning atJO in the second segment c after the initial dial 0, with the figures 1 throughout the segment e, and increased by 1 for each successive section e throughout the dial circle 0, the same as in the former case, each figure being positioned directly opposite, radially, the successive segment figures in each section, and indicate the number of inches and fractions thereof, accumulated by the preceding segment sections, during successive dial operations, and the sum-total is dis closed through the indicator opening i3 formed through the tabulator frame 3, as successive dial operations are made. Also through the face of the tabulating frame 3 is formed a circular segment slot openin l4 positioned directly over the outer circle C graduation holes, exposing a predetermined number of graduation holes 8 therethrough, and is provided with a series of fractional numerals, positioned clock-wise from 1% to i-E along the adjacent curved slot edge, positioned directly opposite, radially, the respective corresponding dial graduation holes, providing convenient means for engaging the proper hole representing the fraction of inches to be added with the operating pencil point rotated counter-clockwise to the zero point of said slot Hi. When the dial I is initially set at its point, the sum-total of all fractionsadded, is disclosed through the tabulator indicator opening 13, reading in both inches and fractions thereof, as said dial is successively operated.

In operating my machine the dial I must first be cleared by a clockwise rotation until the disc notch d engages the spring latch I, thus setting all initial 0 of all graduation circles within their respective tabulator indicator openings. The feet, or inches, or fractions must each be added separately on their respective dial graduation circles, A, B, or C, and when the addition of one class of units has been completed, its sum-total must be recorded on a memorandum, and the dial cleared and reset for a repeat operation of the next class of units. In no case can the sum-total be greater than one full dial rotation and be recorded. If greater sums are required, the number of full disc revolutions must be noted, and the total sum-total of the respective graduation circle, for each revolution, must be added to the amounts disclosed within the respective indicator opening.

Any design of tabulator frame may be used with the dial I, even to the covering of the full dial surface, and is provided with suitable operating and indicator openings, and the dial 1 may also be of various designs varying from beveled, conical, and even to cylindrical surfaces, and still operate in the same manner and with the same results, and are included herewith. It is to be understood that the dial graduation points may be changed and redesigned to meet requirements of any class of units, either for weights, measures, or values 8zc., without departing from the spirit of my invention, and are included herein.

Having fully described my dial adding machine, what I claim as my invention and esire to secure by Letters Patent is:

A dial adding machine comprising a tabulating frame formed of double circular segments joined together along their circumference edges, and having a circular bearing disc fixedly mounted therebetween at the segment circle center, said frame being formed with circular are operating and indicator recesses positioned along concentric circles about its bearing center, a graduated computing dial rotatably mounted on said frame bearing disc, said dial graduations being arranged in three concentric circles each positioned to rotate beneath its respective frame operating and indicator recess openings, designed to represent feet, inches, and fractions of inches, respectively, a suitable pencil point operating hole formed through the dial at each graduation point, numerals placed at each dial graduation point hole, to indicate feet, inches, and fractions of inches respectively, as are there represented, means for rotating said dial within the tabulating frame operating recesses a predetermined distance for each numerical amount to be added, and in a manner to position the sum-total within the respective frame indicator opening, and spring latch means for locking said dial at its initial zero position when rotated anti-clockwise for clearing the machine.

EDWARD T. KNOPKE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 334,064 Watson Jan. 12, 1886 354,789 Hix Dec. 21, 1886 1,188,108 Smith June 20, 1916 1,193,858 Ball Aug. 8, 1916 1,271,992 Baldwin July 9, 1918 1,382,331 Thomas June 21, 1921 1,487,069 Landenberger Mar. 18, 1924 2,237,873 Barok Apr. 8, 1941 

